不是立体几何，一本书切成了两个残缺的书，你只想到了其中一本残缺的书。合起来就是8个角。

来源: QualityWithoutName 于 2026-03-19 08:49:28 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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